UPDATE IT TO WORK WITH 1.21 PLEASE

[Skull-B0Y]

Please add it to work with 1.21

[github-actions]

Thanks for raising attention towards the need for a port to a Minecraft version.

Though, the author is already aware of such version, there isn't much need for further comments.
Given an annoying increase in "new version when" comments on diverse platforms, such issues won't allow comment anymore
as it does not help making a faster release.

Thank you for your understanding.

[LambdAurora]

Duplicate, seriously...